Physical Sciences and Mathematics Commons^™

A Geostatistical Model Based Approach To Evaluate Spatial Variability Of Arsenic In Soil And To Compare Arsenic Hyperaccumulation Efficiency Of Two Fern Species, Nabeel Niazi, Balwant Singh, T Bishop

Dr Nabeel Khan Niazi

No abstract provided.

Evaluation Of Spatial Variability Of Soil Arsenic Adjacent To A Disused Cattle-Dip Site, Using Model-Based Geostatistics, Nabeel Niazi, Thomas Bishop, Balwant Singh

Dr Nabeel Khan Niazi

This study investigated the spatial variability of total and phosphate-extractable arsenic (As) concentrations in soil adjacent to a cattle-dip site, employing a linear mixed model-based geostatistical approach. The soil samples in the study area (n = 102 in 8.1 m²) were taken at the nodes of a 0.30 × 0.35 m grid. The results showed that total As concentration (0-0.2 m depth) and phosphate-extractable As concentration (at depths of 0-0.2, 0.2-0.4, and 0.4-0.6 m) in soil adjacent to the dip varied greatly. Both total and phosphate-extractable soil As concentrations significantly (p = 0.004-0.048) increased toward the cattle-dip. Using …

Soil Contaminants: Sources, Effects And Approaches For Remediation, Ghulam Murtaza, Behzad Murtaza, Nabeel Niazi, Muhammad Sabir

Dr Nabeel Khan Niazi

The contamination of soils with various inorganic and organic contaminants led to the degradation of large expenses of urban and arable lands throughout the world. The presence of toxic contaminants poses a significant health risk to humans and other ecological systems. Scattered literature is harnessed to critically review the various natural and anthropogenic sources and potential hazards and to identify the best possible remediation strategies for a number of contaminants, mainly those inorganic in nature such as arsenic (As), cadmium (Cd), chromium (Cr), copper (Cu), lead (Pb), mercury (Hg), nickel (Ni), and zinc (Zn) commonly found in the contaminated soils. …

Using Mid Infrared Spectroscopy And Partial-Least Squares Regression To Estimate Soil Arsenic Content At An Arsenic-Contaminated Site, Nabeel Niazi, Balwant Singh

Dr Nabeel Khan Niazi

No abstract provided.

Letter To The Editor Regarding, “First Evidence On Different Transportation Modes Of Arsenic And Phosphorus In Arsenic Hyperaccumulator Pteris Vittata” By Lei Et Al. (2012), Nabeel Niazi, Anthony Kachenko

Dr Nabeel Khan Niazi

No abstract provided.

A Comparative Study To Evaluate The Phytoremediation Potential Of Two Fern Species For The Remediation Of An Arsenic Contaminated Site Under Field Conditions, Nabeel Niazi, Balwant Singh, Lukas Van Zwieten, Anthony Kachenko

Dr Nabeel Khan Niazi

No abstract provided.

Remediation Of Arsenic-Contaminated Water Using Orange Peel As A Biosorbent, M Abid, Nabeel Niazi, I Bibi, A Farooqi, M Shahid, G Murtaza, M Shakoor, F Ali

Dr Nabeel Khan Niazi

No abstract provided.

Mechanisms Of Metal-Phosphates Formation In The Rhizosphere Soils Of Pea And Tomato: Environmental And Sanitary Consequences, Annabelle Austruy, Muhammad Shahid, Tiantian Xiong, Maryse Castrec, Virginie Payre, Nabeel Niazi, Muhammad Sabir, Camille Dumat

Dr Nabeel Khan Niazi

Purpose: At the global scale, soil contamination with persistent metals such as lead (Pb), zinc (Zn), and copper (Cu) induces a serious threat of entering the human food chain. In the recent past, different natural and synthetic compounds have been used to immobilize metals in soil environments. However, the mechanisms involved in amendment-induced immobilization of metals in soil remained unclear. The objective of the present work was therefore to determine the mechanisms involved in metal-phosphates formation in the rhizospheric soils of pea and tomato currently cultivated in kitchen gardens. Materials and methods: Pea and tomato were cultivated on a soil …

A Long Term Study To Evaluate The Phytoremediation Potential Of Pteris Vittata L. And Pityrogramma Calomelanos Var. Austroamericana, Nabeel Niazi, Balwant Singh, Lukas Van Zwieten, Anthony Kachenko

Dr Nabeel Khan Niazi

No abstract provided.

Phytoavailability Of Potassium To Zea Mays L. Grown In Agricultural Soils With Contrasting Textures And Mineralogy, M Faheem, I Bibi, Nabeel Niazi, G Murtaza, U Riaz

Dr Nabeel Khan Niazi

No abstract provided.

Mid-Infrared Spectroscopy And Partial Least-Squares Regression To Estimate Soil Arsenic At A Highly Variable Arsenic-Contaminated Site, Nabeel Niazi, Balwant Singh, B Minasny

Dr Nabeel Khan Niazi

The potential of mid-infrared spectroscopy in combination with partial least-squares regression was investigated to estimate total and phosphate-extractable arsenic contents in soil samples collected from a highly variable arsenic-contaminated disused cattle-dip site. Principal component analysis was performed prior to mid-infrared partial least-squares analysis to identify spectral outliers in the absorbance spectra of soil samples. The mid-infrared partial least-squares calibration model (n = 149) excluding spectral outliers showed an acceptable reliability (coefficient of determination, R2c = 0.75 (P < 0.01); ratio of performance to interquartile distance, RPIQ_c = 2.20) to estimate total soil arsenic. For total soil arsenic, the validation of final calibration model using 149 unknown …

Effect Of Phosphate On The Phytoextraction Of Arsenic From Arsenic-Contaminated Soils Using Brassica Juncea L. And Brassica Napus L., A Fatima, Nabeel Niazi, I Bibi, T Aziz, G Murtaza, M Shakoor

Dr Nabeel Khan Niazi

No abstract provided.

Establishment And Optimization Of Callus-To-Plant Regeneration System Using Mature And Immature Embryos Of Maize (Zea Mays), F Ali, M Ahson, N Saeed, M Ahmed, Q Ali, N Kanwal, M Tehseen, U Ijaz, I Bibi, Nabeel Niazi

Dr Nabeel Khan Niazi

Two experiments were conducted to develop an efficient maize regeneration system using mature and immature embryos of four maize elite lines (Agaiti-85, Golden, Soneri and Sultan). The comparative studies revealed that all maize lines were responsive to callus and plant regeneration from mature and immature embryos. The culture medium Chu's N6 was used in both experiments. Immature embryos efficiently produced callus and regenerated plants therefore, when cultured on medium supplemented with 2,4-D, kinetin, 6-BAP and IBA at concentrations of 2 mL L^-1, 0.2, 0.2 and 0.3 g L^-1, respectively. However, callus-to-plant regeneration system for mature embryos …

Comparative Study For The Arsenic Hyperaccumulation By Ferns: A Model-Based Geostatistical Approach, Nabeel Niazi, T Bishop, Balwant Singh

Dr Nabeel Khan Niazi

No abstract provided.

Arsenic Hyperaccumulation By Ferns: A Field Study In Northern Nsw, Nabeel Niazi, Balwant Singh, Lukas Van Zwieten, Anthony Kachenko

Dr Nabeel Khan Niazi

No abstract provided.

Arsenic Speciation And Phytoavailability In Contaminated Soils Using A Sequential Extraction Procedure And Xanes Spectroscopy, Nabeel Niazi, Balwant Singh, Pushan Shah

Dr Nabeel Khan Niazi

In this study, a sequential extraction procedure (SEP) and X-ray absorption near edge structure (XANES) spectroscopy were used to determine the solid-phase speciation and phytoavailability of arsenic (As) of historically contaminated soils from As containing pesticides and herbicides and soils spiked with As in the laboratory. Brassica juncea was grown in the contaminated soils to measure plant available As in a glasshouse experiment. Arsenic associated with amorphous Fe oxides was found to be the dominant phase using both SEP and XANES spectroscopy. Arsenic predominantly existed in arsenate (As V) form in the soils; in a few samples As was also …

Phytoremediation Potential Of Pityrogramma Calomelanos Var. Austroamericana And Pterris Vittata L. Grown At A Highly Variable Arsenic Contaminated Site, Nabeel Niazi, Balwant Singh, Lukas Van Zwieten, Anthony Kachenko

Dr Nabeel Khan Niazi

In this study, the phytoextraction potential of Pityrogramma calomelanos var. austroamericana (gold dust fern) was compared with the well-known arsenic (As) hyperaccumulator, Pteris vittata L. (Chinese brake fern) at a disused cattle dip site in northern New South Wales, Australia. Geostatistical analysis showed that the concentrations of total (at 0–20 cm depth) and phosphate-extractable (at 0–20, 20–40 and 40–60 cm depths) As were spatially variable at the site and this extreme variability (< 1 m) was also evident in the spatial maps of As. Gold dust fern produced greater frond dry biomass (mean=130 g/plant; n=40) than Chinese brake fern (mean=81 …

Evaluating The Effect Of Ph On Potassium (K) Release Rate From Mica Mineral Weathering In Alkaline Solutions At 25°C, U Riaz, I Bibi, G Murtaza, Nabeel Niazi, R Sarfraz, M Faheem

Dr Nabeel Khan Niazi

No abstract provided.

Phytoremediation Of An Arsenic-Contaminated Site Using Pteris Vittata L. And Pityrogramma Calomelanos Var. Austroamericana: A Long-Term Study, Nabeel Niazi, B Singh, L Van Zwieten, A Kachenko

Dr Nabeel Khan Niazi

This field study investigated the phytoremediation potential of two arsenic (As) hyperaccumulating fern species, Pityrogramma calomelanos var. austroamericana and Pteris vittata over 27-month duration at a disused As-contaminated cattle-dip site located at Wollongbar, NSW, Australia. Ferns planted in January 2009 were harvested following 10, 22 and 27 months of growth. A detailed soil sampling was undertaken in June 2009 (initial, n = 42 per plot) and limited sampling in April 2011 (after 27 months, n  = 15 per plot) to measure total and phosphate-extractable As concentrations in soil at 0 − 20-, 20 − 40- and 40 − 60-cm depths. …

Bioavailability Of Arsenic To Zea Mays L. Grown In Contaminated Soils With Contrasting Textures: Effect Of Compost Application, T Mehmood, Nabeel Niazi, I Bibi, M Nawaz, G Murtaza, H Asghar

Dr Nabeel Khan Niazi

No abstract provided.

Speciation And Bioavailability Of Arsenic In Contaminated Soils Using X-Ray Absorption Near Edge Structure Spectroscopy And A Sequential Extraction Procedure, Nabeel Niazi, Balwant Singh, Pushan Shah

Dr Nabeel Khan Niazi

No abstract provided.

Phytoremediation Potential Of Pityrogramma Calomelanos Var. Austroamericana And Pteris Vittata L. Grown At A Highly Variable Arsenic Contaminated Site, Nabeel Niazi, Balwant Singh, Lukas Van Zwieten, Anthony Kachenko

Dr Nabeel Khan Niazi

This study examined the phytoextraction potential of two arsenic (As) hyperaccumulators, Pteris vittata L. and Pityrogramma calomelanos var. austroamericana at a historical As-contaminated cattle dip site in northern New South Wales (NSW), Australia. Total As concentration in the surface soil (0–20 cm) showed a better spatial structure than phosphate-extractable As in the surface and sub-surface soil at this site. P. calomelanos var. austroamericana produced greater frond dry biomass (mean = 130 g plant−1) than P. vittata (mean = 81 g plant−1) after 10 months of growth. Arsenic concentration and uptake in fronds were also significantly higher in P. calomelanos var. …

Heavy Metal Uptake Behavior Of River Red Gum (Eucalyptus Camaldulensis) For Lead (Pb) Is Modified Under Saline Conditions, M Nawaz, S Chaudary, M Tanvir, S Gul, Nabeel Niazi

Dr Nabeel Khan Niazi

No abstract provided.

Using Model-Based Geostatistics To Develop Design-Based Sampling Guidelines For Estimating Arsenic Contamination Around Cattle-Dip Sites, Nabeel Niazi, T Bishop, Balwant Singh

Dr Nabeel Khan Niazi

In the past Arsenical pesticides were used across New South Wales, Australia to control ticks in livestock at now disused cattle dip sites which resulted in the contamination of surrounding soils with elevated and extremely variable As concentrations. Estimating the spatial distribution of As in soil is imperative to delineate its level and spread of contamination. Therefore, the aims of this study were to (1) quantify spatial-variation in soil As content around a cattle dip site and map this using linear mixed models, and (2) use the information on the spatial variability pattern to give guidelines on the sample size …

Exhibition Catalogue — Imprints And Impressions: Milestones In Human Progress, Paul H. Benson, Sandra A. Yocum, Mark Masthay, Donald J. Polzella

Donald J. Polzella

Exhibition catalogue for Imprints and Impressions: Milestones in Human Progress — Highlights from the Rose Rare Book Collection. Includes an introduction by Kathleen M. Webb, dean of University Libraries; essays about the impact of the exhibition's books on modern inquiry, the humanities, the sciences, and the social sciences; and photographs of the works in the exhibit.

Rare Books And Social Science, Donald J. Polzella

Donald J. Polzella

An essay on the impact of the works in the Imprints and Impressions: Milestones in Human Progress, an exhibition of rare books from the collection of Stuart Rose. Exhibition was held Sept. 29-Nov. 9, 2014, at the University of Dayton.

Boundedness In Functional Dynamic Equations On Time Scales, Elvan Akin, Youssef N. Raffoul

Youssef N. Raffoul

Using nonnegative definite Lyapunov functionals, we prove general theorems for the boundedness of all solutions of a functional dynamic equation on time scales. We apply our obtained results to linear and nonlinear Volterra integro-dynamic equations on time scales by displaying suitable Lyapunov functionals.

Exponential Stability In Functional Dynamic Equations On Time Scales, Elvan Akin, Youssef Raffoul, Christopher Tisdell

Youssef N. Raffoul

We are interested in the exponential stability of the zero solution of a functional dynamic equation on a time scale, a nonempty closed subset of real numbers. The approach is based on suitable Lyapunov functionals and certain inequalities. We apply our results to obtain exponential stability in Volterra integrodynamic equations on time scales.

Let’S Act Now, While Things Are Good! Social Change And The Need For Policy Action In Maine’S Lobster Industry, Samuel Belknap

The Cohen Journal

The motivation behind this letter was a remark by Maine Department of Marine Resources Lobster Biologist, Carl Wilson. While attending the Rockland Maine based Island Institute’s annual Climate Round Table event, where fishermen, scientists, and others gather to talk about the past year in the Gulf of Maine, Wilson said, in reference to the lobster industry, “When the resource changes, everything changes.” This comment, poetic in its simplicity, got me to start thinking. I began retracing the history of Maine’s lobster industry to find examples of Wilson’s statement, and I was surprised by how many instances supported this comment. What …

The Exchanged Ef-Hands In Calmodulin And Troponin C Chimeras Impair The Ca2+-Induced Hydrophobicity And Alter The Interaction With Orai1: A Spectroscopic, Thermodynamic And Kinetic Study, Drake Jensen, Nicole Reynolds, Ya-Ping Yang, Shubha Shakya, Zhi-Qiang Wang, Dennis J. Stuehr, Chin-Chuan Wei

Chemistry Faculty Research, Scholarship, and Creative Activity

Background

Calmodulin (CaM) plays an important role in Ca²⁺-dependent signal transduction. Ca²⁺ binding to CaM triggers a conformational change, forming a hydrophobic patch that is important for target protein recognition. CaM regulates a Ca²⁺-dependent inactivation process in store-operated Ca²⁺entry, by interacting Orai1. To understand the relationship between Ca²⁺-induced hydrophobicity and CaM/Orai interaction, chimera proteins constructed by exchanging EF-hands of CaM with those of Troponin C (TnC) are used as an informative probe to better understand the functionality of each EF-hand.

Results

ANS was used to assess the context of the induced …